Concrete wall.



WITNESSES:

P. H. BOSWORTH.

CONCRETE WALL.

APPLIOATION FILED 8EPT.21,1908.

Patented July 6, 1909.

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UNITED STATES PATENT oFnroE.

PAUL H. BOSWORTH, OF SAN FRANCISCO, CALIFORNIA.

CONGRE'IE WALL.

To all whom it may concern:

Be it known that I, PAUL H. BOSWORTI-I, a citizen of the United States, residing at San Francisco, in the county-of San Francisco and State of California, have invented new and useful Improvements in Concrete Walls, of which the following is a specification.

The present invention relates to improvements in concrete walls either interior or exterior. In building such walls, it is generally considered desirable to make them hollow, and the object of the present invention is to provide a construction by means of which said hollow walls may be formed with economy of time, labor, and material, so as to have maximum strength for a given width.

In the accompanying drawing, Figure 1 is a broken perspective view of a portion of wall constructed in accordance with my construction; Fig. 2 is an enlarged transverse vertical section; Fig. 3 is a transverse hori zontal section. a

In forming my improved hollow walls, I provide a metallic hollow form 1, which is made of thin sheet metal, as sheet iron, and is preferably made in sections. Each section comprises a main central portion 2, and lateral flanges. The flanges 3 of the sections of the form on one side are bent over to form grooves, in which the edges of the flanges 4 of the section at the other side can slide. Each main or central portion 2 is corrugated in the lengthwise or vertical direction of the form, each form section being concaved, so that when two opposite form sections are united by their flanges, as heretofore described, they form an elongated flattened tube having corrugated sides. It is to be understood, however, that the precise cross-sectional shape of these forms may vary to corres end with the character or shape of the wa is in which they are placed. The hollow forms are made in lengths corresponding with the height of a regular course of the wall, a convenient height for such courses being two feet. The up er and lower ends of the central portion or each form section are formed with lips 7, 8, the lower lip 7 of one form section overlapping the upper lip 8 of the next lower form section on the same side of the wall. The joints of the form sections are preferably staggered on opposite sides, those on either side being opposite to the middles of the sections at the other side. As the Specification of Letters Patent.

Application filed September 21, 1908.

Patented July 6, 1909. Serial No. 454,055.

form is progressively built up within the mold, the concrete is poured in and then allowed to set. The height of the course of the wall which is made at one time is not sufiiciently great to produce any material pressure.

1. A concrete wall having embedded therein a hollow metallic form with corrugated sides, substantially as described.

2. A concrete wall having embedded therein a hollow metallic form, the walls ofwhich are corrugated lengthwise of the general. direction of the form, substantially as described.

3. A concrete wall having embedded therein a hollow form made up of sheet metal form sections concaved to reduce, when secured together, a tubular 'orm having edges arranged to removably engage each other, substantially as described.

4. A concrete wall having embedded therein a hollow form made up of sheet metal form sections concaved to produce, when secured together, a tubular form having edges arranged to removably engage each other, and having upper and lower edges, the edge of a form section on one side overlapping the adjacent edge of a form section on the same side, substantially as described.

5. A concrete Wall having embedded therein a hollow form made up of sheet metal form sections concaved to H reduce, when secured together, a tubular torm having edges arranged to removably engage each other, and having upper and lower edges, the edge of a form section on one side overlapping the adjacent edge of a form section on the same side, the joints on one side being staggered relatively to those on the opposite side, substantially as described.

6. A concrete Wall having a hollow form embedded therein com osed of metallic form sections concaved an having, the one a grooved flange, and the other a flange engaging said groove, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

PAUL H. BOSWORTH.

Witnesses:

F. M. WRIGHT, D. B. Rronanns. 

